Remove more compilation warnings in MinGW64 build

* src/w32.c (faccessat, map_w32_filename):
* src/w32fns.c (w32_wnd_proc):
* src/w32term.c (w32_horizontal_scroll_bar_handle_click)
(w32_scroll_bar_handle_click): Use FALLTHROUGH to avoid compiler
warnings with GCC 7 and later.

1 files changed, 2 insertions, 0 deletions

diff --git a/src/w32term.c b/src/w32term.c
index 2785ae2b52d..e62ae7e8426 100644
--- a/src/w32term.c
+++ b/src/w32term.c
@@ -4346,6 +4346,7 @@ w32_scroll_bar_handle_click (struct scroll_bar *bar, W32Msg *msg,
             SetScrollInfo (SCROLL_BAR_W32_WINDOW (bar), SB_CTL, &si, TRUE);
           }
         /* fall through */
+        FALLTHROUGH;
       default:
         emacs_event->kind = NO_EVENT;
         return FALSE;
@@ -4460,6 +4461,7 @@ w32_horizontal_scroll_bar_handle_click (struct scroll_bar *bar, W32Msg *msg,
             SetScrollInfo (SCROLL_BAR_W32_WINDOW (bar), SB_CTL, &si, TRUE);
           }
         /* fall through */
+        FALLTHROUGH;
       default:
         emacs_event->kind = NO_EVENT;
         return FALSE;